Improved implement for cutting rubber



E.HUBNER.

' Implement for Cuttng"'Bubber; &c.

" Patented Apri! 25, "1865,

UNITED STATES PATENT OFFICE.

EMIL HUBNER, OF NEWT YORK, N. Y.

IMPROVED IMPLEMENT FOR CUTTING RUBBER, &c\

Specification forming part of Letters Patent No. 47,421, dated April 25, 1865.

n r//ZZ whom, it may concern.'

Be it known that I, EMIL HUBNER, of the city, county, and State of New York, have invented a new and Improved Circular Gutter 5 and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figurel is a side elevation of this invention, partly in section. Fig. 2 is an end view ot' the same. Fig. 3 is a plan or top View of the same.

Similar letters of reference indicate like parts.

The object of this invention is to cut out circular disks or rings of india-rubber or other material, such as used for packing of flanges and other circular parts of steamengines and other machines. To effect this purpose a movable knife-holder is secured to a rod provided with a rule and with a screw-handle and fixed center in such a manner that the knife can be adjusted at any desired distance from the fixed center, and by turning the handle the knifeholder can be released or fastened at any desired point on the rule. The fixed center is secured in a stationary head provided with a surrounding arm rest in such a manner that the operator is enabledto press the fixed center down with his arm and take hold and operate the knife with one hand, while his other hand is free to hold the material and move it against the knife, and the cutting operation can be executed in a short time with ease and with perfect exactness. j

A represents a rod or rule of a square, oblon g7 or polygonal cross-section, made of wood or metal, and provided with a scale of inches, half-inches, quarters, and eighths, and,if dcsired, the division may be carried on still further. This rule is firmly secured at one end to a head, B, which carries in its bottom end the stationary center a, made of a pointed piece of steel wire or other suitable material, and from the top of said head rises the armrest b, which is so arranged that it can swivel in either direction independent of the head. The rule A forms the guide for the movable head C, to the lower end of which the knife d is secured by means of a screw or screws, c, in such amanner that it can be readily removed whenever it may be necessary to sharpen it or replace it by another. Said knife is provided with a rounded point and two cuttinged ges-one on each sidethough I do not wish to confine myself to any partcular-shaped knife, but reserve the right to change the same as circumstances may make desirable. Both the knife and stationary center are secured to their respective heads on the inner faces thereof, or as close to the arm as possible, so that they can be brought as close together as may be desirable. The movable head is operated by a handle, D, which is fastened to the same by a screw, f, the inner end of which bears upon a frictionplate, g, sliding on the edge of the rule. By turning the handle in one direction said friction -plate is pressed down hard upon the edge of the rule and the head is rendered rigid with the same, and by turning the handle in the opposite direction the head is released s0 that it can be adj usted at any desired distance from the stationary center. If it is desired,

for instance, to cut out a flange with a threeinch hole and nine inches outside diameter, the head G is rst adjusted at a distance of four and one-half inches from the stationary center, and by placing the right arm in the arm-rest and taking hold of the handle with the right hand the centerpin can be held down in the desired spot and the knife operated while the left hand is free to move thematerial against the knife. After the flange has been cut out in this manner the head G is moved to a distance of one and one-half inch from the center, and the hole is cut out in the same manner. packing for circular flanges and other circular parts of steam-engines and other machines can be cutout with little loss of time, and all unnecessary waste of the materialfrom which the packing is made can be avoided.

I claim as new and desire to secure by Letters Patent- 1. An adjustable circular packingcutter, constructed as herein described, as a new article of manufacture.

By means of this tool 2. The movable head C, holding the knife vthe center a and adjustable knife d, cond, in combination with the rule A, screwstructed and operating substantially as and. handle D, and stationary center a, constructed for the purpose described.

and operating substantially as and for the EMIL HUBNER'. purpose set forth. Witnesses:

3. The swveling or stationary arm-rest M. M. LIVINGSTON, in the stationary head B, in combination with C. L. ToPLiFF. 

